Lock



Feb. 26, 1.92.9.

' 1,703,845 nal-mno Loox t Filed Aug. l, 192B INVENTOR AT1r RNEYS Patented` Feb. 26, 1929.

UNITED STATES 1,703,845 PATENT OFFICE.

NORMAN B. HURD, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR' TO THE AMERICAN HARDWARECORPORATION, OF NEW BRITAIN, CONNECTICUT, A CORPORATION 0F CONNECTICUT.

LOCK.

Application led August 1, 1928. Serial No. 296,651.

This invention relates to locks, and particularly to a type of lock operated in a manner to operate a latch with one key, and in a manner to operate a locking bolt with a special or master-key. n

An object of the invention is to provide a lock adapted tor normal use by the 1nsertion of an ordinary key, but which, by the use of a special master-key, may be operated in a different or modified manner.

A further object of the invention is to provide a lock of the tumbler type, the key receiving part of which is adapted to be oscillated between lixed limits by the use of an ordinary key, but which is adapted to be Vfreely rotated by the insertion of the special or master-key. Y

Another object of the invention is to provide interengaging abutments on a portion of the lock and on a part movable with the key plug and adapted normally to be engaged upon oscillation of the key-receiving plug, the abutment on lthe roll-back being movable upon insertion ot' a special key to avoid engagement with said projections.

Another object of the invention is to provvide amember movable along the roll-back of a lock toward and from its axis of rota-V tion, this slide being normally spring pressed in one direction and having a projection which, in one position, will engage and limit oscillation of the plug by contacting with fixed projections on the cylinder, but when moved against the spring, the projection on the roll-back avoids engagement with said outstanding. projections on the cylinder and the plug is free to rotate.

A further object of the invent-ion is to provide a special key', insertible in the keyreceiving plug and being iitted-to control the tumblers in the usual manner and providing means adapted to engage and actuate a slide movable on the roll-back.

W'ith these and other objects in view, my invention consists in the features of construction and operation set forth in the following speciiication and illustrated in the accompanying drawing.

In the accompanying drawing annexed hereto and forming a part of this specilication, I have shown my invention embodied in a multiple tumbler lock, but it will be understood that the invention can be otherwise embodied and that the drawing is not further illustrated.

to be construed as defining or limiting the scope of the invention, the claims appended to this specification being relied upon for that purpose.

In the drawing- Fig. 1 is a rear elevation of a lock .provided with the present invention;

,F ig. 2 is a similar view of the lock, but with certain parts moved to a Ydifferent Y position;

Fig. 3 is a view taken upon the line 4-4, with the parts of the roll-back in the po? sition shown in Fig. 1;

Fig. 4 is a view taken upon the plane of the linei-i, with the parts of the roll-back moved to the position shown in Fig. 5;.and

Fig. 5 is a side elevation of a complete lock, the roll-back being shown in section to more clearly show the movable parts thereon. Y

In the above mentioned drawing I have shown but one embodiment ofthe invention, which is now deemed preferable, but it is to be understood that changes and modications may be made within the scope of the appended claims, without departing from the spirit of the invention.V

Referring more in detail t0 the figures of the drawing, I show a lock cylinder 10 of the conventional or standard multiple tumbler type, having a key-receiving plug 11 rotatably mounted therein and tumblers (not shown) operating within the cylinder l() adapted to enter holes in the plug. As these parts may be of any well known form, it is not thought necessary that they be It will be understood that when a key 12 of the general form shown in outline in Fig. 5 is inserted within the plug 11, the plug 11 will move the tumblers to a position permitting oscillation ot the plug 11 together with the roll-back 13 attached to its rear face.

Outwardly projecting'from the rear face of the cylinder 10 are pins 14 or other forms ot project-ions, fixed rigidly in position and limiting the oscillatory movement of the plug 11 by contacting with a part 15 on the roll-back 13. The part 15 on the roll-back 13 engaged yby the pins 14comprises a small forwardly extending projection attached permanently in any preferred manner to a slide 16 movable vwithin ways extending longitudinally along the roll-back 13. With the projection 15 and slide 16 in the position f shown in Figs. 1 and 3, a portion of the projection 15, when the plug ll'is oscillated, strikes the pins 111, and therefore limits oscillatory movement of the roll-back 13. [This movement, however, is suilicient for normally operating the latch of the lock, which is accomplished by a key of the conventional type accommodated to the tumblers used in the lock.

ln order to freely rotate the plug 11 and roll-back 1B throughout a complete revolution, means is provided for moving the proT jection 15 and the slide 16 carried by the roll-back 13 to a position where it will not contact with the pins 14 when the plug 11 is oscillated. This is accoii'iplished by the insertion of aspecial key 12 oi greater length than the ordinary key, the mid-section of which is litted in accordancewith the Vtumbler system of the lock, and the rear end has a projection 17 striking and V'lorcing outwardly the slide 16 movable within the rollback 13.: Movement of the slide 16 to the position shown in Figs. 2, d and 5 moves theV projection 15 carried by the roll-back 13 to aposition beyond that in which it would engage the pinsl 14. Y The roll-back 13 is suitably recessed as shown at v18 in those portions which would otherwise come in conr tact with the outstanding pins 14. 7With the slide 1,6 forced to its outer position, the rollback 1B. is enabled to pass over the pins 1d and be freely rotated with the plug 11. rl`his complete rotative movement of the plug 11 and roll-.back 13 may beused to operate the locking bolt of the lock.

I claim;

il. ,ln a lock, a cylinder, a rotatable keyn receiving plug therein, a rollback on said plug, and abutment means on said cylinder and rollback for allowing a` limited rotation of said plug, said abutment means beine 'D relatively movable to avoid relative engagement thereof, i''or Vthe purpose described.

2. In a lock, a cylinder,'a rotatablel key-receiving plug therein, a. rollback on said plug, and abutment means on said cylinder and rollback for allowing' a limited rotation of said plug, said abutment means being relatively movable by a key insertible in said plugv to cause said abutment means on said rollback and cylinder to avoid engagement, for the purpose described. Y

,ii lock comprising, in combination, a cylinder, a rotatable key/deceiving plug therein, a rollback secure-d to said plug, projections on 4Said cylinder, a slide on said rollback engaged by said projections whereby the rotative movement of said rollback is limited, and means to movetlie slide o n said rollback to avoid engagement with said pro 'jections il lock comprising, in combination, a cylinder, a rotatable key-receiving plug therein, a rollback secured to said plug, projections on said cylinder, a siideon said rollback hai-.fing a projection thereon Ven-V gaged by said projections when said slide is in one position whereby the rotative nmoirement of said rollback is limited, andnieans to move the slide radially ontw id on said rollback to avoid engagement with saidprof jections. i

A lock comprising, in combination, a cylinder, la rotatable key-receiving plug therein, tumblers movable between said cylinder and plug, a rollback secured to said plug, a slide movable along said rollback,v

a projection on said slide extending closely adjacent the end ot said cylinder, fixed projections outstanding from the end Aface of said cylinder normally engaged by Vsaid projection on said slide and limiting rotation otsaid plug, and means insertible in said plug for moving said slide and its projection tov avoid engagement with said projections on said cylinder.

N ORMAN B, HURD. 

